Safety grater



Jui? 30, 1945- x. RQENELQoxx/ 229405,65@

SAFETY GRATER Filed Dec. 3l, 1941 llmiilmmlww Patented July 30, 1946 UNITED STATES PATENT OFFICE SAFETY GRATER Irving Rosenbloom, New York, N. Y., assignor to Renwal Manufacturing Co., Inc., New York, N. Y., a corporation of New York Application December 31, 1941, Serial No. 425,073

10 Claims. 1

This invention relates to improvements in graters, and more particularly to a novel, prac tical, plastic grater.

It is among the objects of the present invention to provide a grater suitable for all grating purposes, and which is always safe to use. In accordance with my invention I provide a unitary grater construction of composition or plastic material. The unitary grater avoids the use of metal or of sharp metallic edges that have characterized prior graters, The resultant grater is rust-proof, effective, and cannot cause injury to the user.

The plastic grater of my present invention is a sturdy, durable utensil, useful for grating foods, vegetables, soaps, breads, and the like. It is also useful for dicing cooked Vegetables and other foodstuffs. My preferred unitary grater construction permits ready cleansing, insuring a sanitary utensil, so essential when used with food. Also, the plastic grater is practical, and relatively inexpensive to fabricate.

These and further objects, advantages and capabilities of my invention will become more apparent in the following description of preferred embodiments thereof, illustrated in the drawing, in which:

Fig. l is a plan View ofr one construction of the unitary grater,

Fig. 2 is a cross-sectional view through the graterof Fig. 1, taken along the line 2-2 thereof.

Fig. k3 is an enlarged perspective view of a detail of the grater of Fig. l.

Fig. 4 is a cross-sectional View, corresponding to Fig. 2, of a modified form for the grater.

Fig. 5 is a plan view of another form of the grater,

Fig. 6 is an enlarged cross-sectional view of the grater of Fig. 5, taken along the line 6 6 thereof.

The construction of the plastic grater of the invention is preferably such as to permit its complete fabrication by a single mechanical molding operation. The plastic material may be of any suitable type, including phenolic resins, such as Bakelite and Catalin; cellulose acetate; acrylic resins, such as Lucite; styrene resins; or other plastic molding composition. The grater may be formed by injection molding, compression molding, or by casting. The preferred plastic grater is a unitary device, Towards this end the invention provides a unitary plastic grater of ample strength and durability, incorporating suitable molded grating surfaces. I have constructed complete practical commercial graters, in accordance with the present invention, by a single injection or compression molding operation. The

result is a unitary grater of pleasant appearance, durable, sturdy, efcient, stainless, sanitary and relatively inexpensive.

Figs. l, 2 and 3 illustrate one exemplication which the unitary plastic grater may assume in practice. The grater comprises a rectangular frame I0 having an extended looped handle Il. A lattice network I2 is integrally formed with framework I0. The lattice network I2 contains a plurality of symmetrically arranged square, or rectangular, openings I3 formed by a series oi regularly spaced horizontal bars I4 and vertical bars I5. Bars I4 and I5 are in the same plane, and are molded to constitute a unitary lattice network construction incorporating the openings I3. The frame I0 and lattice network I2 are molded as a single unitary structure, with the ends of bars I4 and I5 integrally terminating in frame IU.

The grating surface of lattice network l2 is formed by shaping bars I4 and I5 thereof so as t0 taper into cutting edges IB and I'I. The crosssectional appearance of bars I4 and I5 are accordingly triangular as Seen in Figs. 2 and 3. in this manner sufficient mechanical strength is irnparted to bars I4 and i5 comprising the lattice network I2, and also insures suitable cutting edges for the grating surface thereof. Additional mechanical strength may be imparted to the lattice network I2 without interfering with the grating or dicing operations of the grater. Towards this end I provide ribs or bulges I8 and I9 on the non-cutting sides of bars I4 and I5 respectively, Strengthening ribs I8 and I8 have a cross-sectional width slightly larger than that of the non-ribbed bars. Such ribs may be provided for selected bars so as not to interfere with the size of diced elements. In the grater embodiment of Fig. 1, ribs I8 and I9 are provided respectively for three symmetrically spaced horizontal bars I4, and two vertical bars I5. It is to be understood that more or less of the bars may be so reinforced within the scope of the invention.

The thickness of the bars containing the strengthening ribs preferably does not exceed the thickness of the frame I0, as shown in Fig. 2. The grating surface is preferably arranged in a plane corresponding with a surface of frame II), so that the frame Will not interfere with the grat ing action. In this manner, for a given thickness of frame I Il, for example fle", a plastic lattice network I2 of ample mechanical strength may be provided for the grater. The tapered nature of the lattice bars I4 and I5 insures durable grating edges that will stand up under all con ditions of use. The strengthening ribs do not aifect the dicing operation of the grater, since the resulting openings I3 in the grater are not unduly interfered with. In one form, the strengthening ribs corresponding to I8 and Isl may be provided for all the horizontal and vertical lattice bars, as will be shown in connection with the form of the invention illustrated in Figs. 5 and 6.

An important feature of the present invention is the novel grating surface arrangement provided for the plastic lattice network. The grating or cutting surface is arranged substantially in a single plane, preferably co-extensive with the corresponding edge of the supporting frame lil. Also, the design of the grating surface is such as to permit its direct molding with the remainder of the grater as a unitary body. Fig. 3 clearly illustrates the preferred nature of the grating edges. rIne lattice bars Ill and I5 taper to narrow or pointed edges IIS and I`I respectively. By providing regular constrictions or spaced narrowed widths 20, 2i along lattice bars I4 and I5, the resultant formations terminate as grating edges Z2, 23, alternated with grating edges I6 and I`I respectively. In this manner two sets of interlaced cutting edges I5, I'I and 22, 23 are formed on the grating surface of the lattice network I2, which sets are in planes substantially close together. The displaced cutting edges constitute sharp saw-tooth cutting surfaces along lattice bars i4, I5. Such arrangement permits the direct molding of practical grating teeth for the plastic grater, which arrangement has been found very satisfactory in practice both from the molding and use standpoints. It is to be understood however, that other serrated or cutting edge constructions for the plastic grating surface may also be utilized.

Fig. 4 illustrates a modified form of the grater, wherein both sides thereof constitute grating surfaces. A transverse series of bars I4 and I5' are arranged similarly to bars Ill and I5 of Fig. 1. 'Ihe bars Iii and i5 taper toward both outer surfaces of the grater. The cross-sectional appearance of the bars is diamond shaped, as shown at I5 in Fig. ll. Serrated grating edges I6 and 22' extend on both sides of bars lll; the grating edges il (and 23', not shown), on both sides of bars l5. The grating edges on each side of the grater correspond to those in the form of the invention in Fig. l, and are integrally formed during the molding operation. The cross-sectional area of the bars I4 and I5 are made sufficient to impart suitable mechanical strength to the grater. The upper and lower grating surface planes are preferably substantially co-extensive with the corresponding surfaces of the frame I0, as shown in Fig. 4.

Fig. 5 is a plan view of a further form which my invention may assume in practice. A rectangular frame 25 encloses a lattice network 26. A handle 2l extends from frame 25, and is integrally molded therewith. The lattice network 26 comprises horizontal bars 28 and vertical bars 29 containing corresponding serrated grating edges 30 and 3| respectively, similar to the previous forms of the invention. As shown in Fig. 6, all the bars 28 and 29 contain ribbed reinforcements S2 and 33 respectively, on the back sides thereof. This arrangement imparts superior mechanical strength to the lattice structure of the grater. The openings 34 in the lattice network 26 are accordingly somewhat smaller than the corresponding openings I3 of the form in CII Fig. 1. This merely reduces the cross-sectional area of the elements diced by the grater.

While I have disclosed preferred embodiments which my invention may assume in practice, it is to be understood that modifications and Variations thereof may be made Without departing from the broader spirit and scope of the invention as expressed in the appended claims.

What I claim, and desire to secure by United States Letters Patents, is:

l. A grater of plastic composition comprising a frame supporting a lattice network composed of intersecting series of parallel bars integrally molded with said frame, said bars being substantially triangular in section and terminating in grating edges lying in a common surface substantially including one face of said frame.

2. A grater of plastic composition comprising a frame supporting a lattice network composed of transverse series of parallel bars in substantially the same plane integrally7 molded with said frame, said bars being triangular in section and terminating in grating edges lying in a plane substantially including one face oisaid frame, said triangular bars extending in height to substantially the other face of said frame.

3. A grater comprising a frame, a lattice network composed of transverse series of bars of plastic material integrally molded with said frame, said bars terminating in grating edges lying in a surface substantially including one face oi' said Iranie, a plurality oi` said bars having reinforcing ridges extending opposltely of said grating edges and merging with said frame.

4. A grater of plastic composition comprising a frame supporting a lattice network composed of transverse series of parallel bars in substantially the same plane integrally molded with said frame, Said bars being triangular in section and terminating in grating edges, said bars having reinforcing ridges extending from the bases thereof and merging with said frame.

5. A grater comprising a frame supporting a lattice network composed of transverse series or' bars, said bars being substantially triangular in section and terminating in sharp grating edges, said bars having regularly spaced constrictions extending to said edges to constitute a serrated grating surface.

6. A grater of plastic composition comprising a frame supporting a lattice network composed or' transverse series of parallel bars integrally molded with said frame, said bars being triangular in section and terminating in grating edges, said bars having regularly spaced constrictions extending to said edges to constitute a serrated grating surface.

rI. A grater comprising a frame, a lattice network composed oi' transverse series 0i' bars in substantially the same plane and made of plastic material integrally molded with said frame, said bars terminating in grating edges lying in a plane substantially including one side of said frame, said triangular bars extending in height to substantially the other side oi' said frame, and said bars having regularly spaced constrictions extending to said edges to constitute a serrated grating surface.

8. A grater of plastic composition comprising a frame, a lattice network composed of transverse series of parallel bars in substantially the same plane integrally molded with said frame, said bars being diamond in section and terminating in sharp grating edges on both sides of the network,

a frame, a lattice network composed of transverse series of parallel bars in substantially the same plane integrally molded with said frame, said bars being diamond in section and terminating in sharp grating edges on both sides of the network, said grating edges lying in planes substantially including the opposite sides of said frame, and said bars having regularly spaced constrictions extending to said edges to conw sttute serrated grating surfaces.

IBVING ROSENBLOOM. 

